1-First, preheat your oven to 350°F (177°C) and line baking sheets with parchment paper. This step keeps things neat and ensures your whoopie pies release easily. Next, in a bowl, whisk together 2 cups all-purpose flour, 6 tablespoons unsweetened natural cocoa powder, 1 and 1/4 teaspoons baking soda, and 1/2 teaspoon salt. It’s all about getting those dry ingredients evenly mixed.

2-Then, using a mixer, beat 1/2 cup softened unsalted butter on medium-high for about 1 minute until it’s smooth. Add 1 cup packed light brown sugar and beat until fluffy, then mix in 1 large room-temperature egg and 1 and 1/2 teaspoons pure vanilla extract until combined. Now, with the mixer on low, alternate adding the dry ingredients and 1 cup buttermilk, starting and ending with the dry mix. The batter will be thick, so don’t overdo it just stir until blended.

3-Shaping and Baking: Drop about 1 and 1/2 tablespoons of batter per cookie onto your prepared sheets, spacing them 3 inches apart. Bake for 10 to 12 minutes until the tops spring back when touched around 11 minutes usually does the trick. Let them cool completely on a wire rack before moving on. For the frosting, melt 1/2 cup unsalted butter in a saucepan over medium heat, then add 1 cup packed light brown sugar and 2 tablespoons heavy cream. Whisk constantly until the sugar dissolves, add 1/4 teaspoon salt, bring to a bubble, and cook for 2-3 minutes.

4-Remove from heat and cool for about 30 minutes. Beat the cooled mixture with a whisk attachment, then gradually add 2 and 1/2 cups sifted confectioners’ sugar and the remaining 3-4 tablespoons heavy cream until it’s spreadable. Pair the cooled cookies by size, spread the frosting on one flat side, and sandwich with another. To adapt for dietary needs, use vegan substitutes like plant-based butter and non-dairy cream this keeps it simple and delicious.